112 lines
3.2 KiB
Groff
112 lines
3.2 KiB
Groff
.\"
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.\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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.\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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.\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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.\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $OpenBSD: dirname.3,v 1.9 2000/04/18 03:01:25 aaron Exp $
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.\" $FreeBSD$
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.\"
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.Dd October 12, 2006
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.Dt DIRNAME 3
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.Os
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.Sh NAME
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.Nm dirname
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.Nd extract the directory part of a pathname
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.Sh SYNOPSIS
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.In libgen.h
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.Ft char *
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.Fn dirname "const char *path"
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.Sh DESCRIPTION
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The
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.Fn dirname
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function
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is the converse of
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.Xr basename 3 ;
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it returns a pointer to the parent directory of the pathname pointed to by
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.Fa path .
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Any trailing
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.Sq \&/
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characters are not counted as part of the directory
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name.
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If
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.Fa path
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is a null pointer, the empty string, or contains no
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.Sq \&/
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characters,
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.Fn dirname
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returns a pointer to the string
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.Qq \&. ,
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signifying the current directory.
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.Sh IMPLEMENTATION NOTES
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The
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.Fn dirname
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function
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returns a pointer to internal storage space allocated on the first call
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that will be overwritten
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by subsequent calls.
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.Pp
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Other vendor implementations of
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.Fn dirname
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may modify the contents of the string passed to
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.Fn dirname ;
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this should be taken into account when writing code which calls this function
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if portability is desired.
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.Sh RETURN VALUES
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On successful completion,
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.Fn dirname
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returns a pointer to the parent directory of
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.Fa path .
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.Pp
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If
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.Fn dirname
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fails, a null pointer is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The following error codes may be set in
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.Va errno :
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.Bl -tag -width Er
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.It Bq Er ENAMETOOLONG
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The path component to be returned was larger than
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.Dv MAXPATHLEN .
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.El
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.Sh SEE ALSO
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.Xr basename 1 ,
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.Xr dirname 1 ,
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.Xr basename 3
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.Sh STANDARDS
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The
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.Fn dirname
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function conforms to
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.St -xpg4.2 .
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.Sh HISTORY
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The
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.Fn dirname
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function first appeared in
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.Ox 2.2
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and
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.Fx 4.2 .
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.Sh AUTHORS
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.An "Todd C. Miller" Aq Todd.Miller@courtesan.com
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